Shaft closing for lifts



J- H. HELLING SHAFT CLOSING FOR LIFTS Filed July 16, 1947 July 24, E951 Patented July 24, 1951 UNITED STATES PATENT OFFICE SHAFT CLOSING FOR LIFTS Johannes H. Hel ling, Rotterdam, Netherlands Application July 16, 1947, Serial No. 761,396 In the Netherlands June 19, 1947 1 Claim.

This invention relates to an improvement of the shaft closing for a lift described in U. S. application filed by Johannes H. Helling, filed October 25, 1945, Serial No. 624,409 and now Patent No. 2,514,058,according to which the accessopenings of the shaft are closed by swing-doors, each of which is provided with hinges adapted to be displaced bodily with the door transversely of the vertical pivotal axis of the door, said shaft opening further being provided with an abutment for cooperation with the door so as to hold the door in closed position against rotation. For opening the door said latter has then to be displaced in its plane in order to be disengaged from the abutment. Said construction of the shaft closing presents the advantage that no locking mechanism is required as the door is freed from the abutment by a small lateral displacement and for closing is again brought into engagement with the abutment. It is only necessary to provide a fixed handle on the door.

With the shaft closing described in said prior U. s. application No. 624,409 and now Patent No.

2,514,058, the door by means of the handle firstly must be laterally shifted for disengaging it from its abutment. The invention has now for its object to improve said prior construction in such a manner that by pulling the handle the door is automatically shifted and, therefore, is disengaged from its abutment.

With this object in view according to the invention the face of theabutment cooperating with a projection of the door is inclined in such a direction that when pulling on the door said latter is laterally shifted and therefore is opened. In order to facilitate said displacement of the door its projection which cooperates with the inclined face of the abutment may be formed as a freely rotatable roller.

The invention will now be described with reference to the drawing, wherein Fig. 1 is a plan view of a double swing door and Fig. 2 is a front view of the upper portion of the cooperating ends of the door wings.

n the beam 20 an abutment l is provided in the centre of the shaft opening, said abutment having recesses 2|, 2| in which the door wings 3, 2 can engage with a roller 4 or 4' respectively.

Said rollers are freely rotatable on pins 22, 22 secured to the door wings. The door hinges 5 are at 6 pivotally connected to the door frame so that the door wings as a whole can be slid laterally so as to disengage the rollers 4, 4' from the recesses 2|, 2| in the abutment I. As the face 23 or 23' respectively of said recesses 1s sufiiciently inclined the door wings will be shifted laterally when pulling on the door wings in a direction perpendicular to their plane, whereby the hinge 5 rotates about the hinge 6. When the roller 4 is disengaged from its recess the door rotates about the hinge 5 and opens. Only by pulling the door it is firstly displaced in lateral direction in order to be disengaged from the abutment and subsequently rotates to open position. The lateral displacement of the doors actuates an electrical contact or switch I6.

What I claim is:

A closure for elevator shaft openings compris ing a swing door, hinges on which the door is mounted, said hinges themselves being pivotally connected to the door frame about an axis extending vertically and parallel to the door and at the same side of the door as the hinges so as to have said hinges displaced bodily with the door and transversely of said pivotal axis, a notched abutment being rigidly secured at the shaft open- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS- Number Name Date 904,304 Bulger Nov. 17, 1908 1,844,978 Renaud Feb. 16, 1932 1,912,846 Keogan June 6, 1933 1,918,911 Hull July 18, 1933 

